hunker



Nov. 3, 1936. M. 1 HUNKER STOVE DAMPER AND MANUFACTURE OF SAME Filed April 8, 1935 2 Sheets-Sheet 1 www Mlfwzier Nov. 3, 1936. M. 1 HUNKER STOVE DAMPER ANDy MANUFACTURE OF SAME Filed April 8, 1935 2 Sheets-Sheet 2 Patented Nov. 3, 1936 PATNT foF-Flcs s'rovli DAMPER AND MANUFACTUE l Martin L. Hunker, Dover, Ohio, assignor to rlhe n Reeves Manufacturing Company,fDover, Ohio,

a corporation of Ohio Application April 8; 1935, Seria1'No.-.15,301

1` claim.' (c1, 12s- 290) The above objects, together with others which `The invention relates to a damper for stoves, particularly adapted for use upon sheet metal heating stoves, and to the manner in which the same .is made.

Dampers of the general type to which the invention pertains comprise a sheet metal plate or disk having a screw threaded stem xed thereto and threaded into a stationary portion of the stove, a handle portion being provided at the outer end of the screw threaded stem for rotating the Asame so as to move the sheet metalplate or disk toward or away from the stove in order to close orunccver an opening in the stove through which air for combustion may be admitted.

In dampers of this general character the screw threaded stem is ordinarily in the form of a malleable iron casting, the sheet metal damper plate or disk being fixed thereto by upsetting an intermediate portion of the malleable iron stem to form lugs or shoulders which are pressed tightly down upon the damper plate, rigidly attaching the same to the stem.

It is also customary to form the handle upon the screw threaded stem by providing a pair of oppcsitely disposed axially alined arms upon the outer end portion of the stem to be grasped between the thumb and fingers in order to rotate the stem to adjust the position of the damper.

Malleable iron castings are expensive as compared with gray iron castings and one object of the present improvement is to provide a damper of the character referred to which is so constructed that the screw threaded stem may be formed of a gray iron casting.

Another object of the improvement is to provide an improved form of handle upon the screw threaded stem by forming outwardly angled cliverging arms upon the outer end of the same, thus locating the ends of the arms, which are engaged by the thumb and fingers, considerably farther away from the hot damper than the usual form of handle, whereby the same will be much cooler, thus preventing the user from burning his thumb or fingers when operating the damper.

A further object is to provide a damper of this character comprising a screw threaded stem having two spaced shoulders near its outer end, the damper plate or disk being formed of sheet metal and having a central opening surrounded by an inwardly disposed annular ange, the sheet metal disk being attached to the threaded stem by springing said ilange over one of said shoulders and then contracting the flange below said Shoulder so as to tightly fix the damper plate upon the stem between the two shoulders.

damper in the manner illustrated in the accompanying drawings,y in which Figure 1 is a rear `or inner elevation of the improved damper and the casting vby means of which it is connected to the stove;

Fig.'2, a front or outer elevation of the same;

Fig. 3, a vertical sectional. view through the damper and casting shown` in Figs. 1 and 2;

. Fig. 4, a sectional'view through the dies means of which the sheet metal damper plate or disk is attached to the threaded stem, the parts of the damper being shown in position for assembly; and

Fig. 5, a similar View showing the manner in which the assembly is completed.

Similar numerals refer to similar parts throughout the drawings.

The type of damper to which the invention pertains is especially adapted for use upon sheet metal heating stoves and for the purpose of mounting the damper upon the sheet metal side wall of the stove, a casting indicated generally at I0 is usually provided, this casting having a central opening II of sufficient size to permit entrance to the stove of the desired amount of air for combustion and being attached to the sheet metal side wall of the stove as by rivets or the like located through the apertures I2 formed in the ears I3 of the casting. A spider or skeleton frame I4 may be located through the center of the opening II and provided with a central threaded aperture I5 through which the screw threaded stem I6 is adjustably located.

This screw threaded stem may be in the form of a gray iron casting and is provided near its outer end with the spaced integral annular shoulders I 'I and I8, the latter being preferably of considerably greater diameter than the shoulder I1.

The stem I6 is preferably flared outward from the screw threaded portion t0 the shoulder I1, as indicated at I9, and the enlarged outer end portion of the stem between the shoulders I'I and I8 is preferably conical or outwardly flared as shown at 20. At the outer end of the stem I6, beyond the shoulder I8, is formed a ball` 2I provided with two oppcsitely disposed outwardly diverging arms 22.

The damper plate or disk 23 may be of sheet metal, preferably slightly conical in formasshown, the peripheral edge being curved inward as at byv 24 so as to tightly t against the face of the casting l when the damper is in closed position, as illustrated in Fig. 3. The damper plate 23 is provided with a central opening surrounded by the inwardly disposed annular flange 25 which is preferably inwardly tapered as shown and which may be shouldered intermediate its ends as at 26.

In attaching the damper plate 23 to the threaded stern, the stem may be first seated in a. die block 2'! provided with a central bore 28 to receive the ball portion 2| of the handle ofthe stem and with the slots 29 to receive the arms 22.

The sheet metal damper plate 23 is then positioned upon the stem as shown in Fig. 4, the screw threaded portion ofthe stem being received through the central opening of the damper plate and the tapered inturned annular flange 25 of the damper plate resting upon the shoulder l1 of the stem.

The upper or movable die, which is in the form of a tube 30 having a rounded lower edge 3|, is then moved downward around the screw threaded stem, the lower end thereof engaging the shouldered portion 26 of the annular ange 25, springing the ange over the shoulder l1, seating the shouldered portion 26 of flange against the shoulder I8 of the stem and forcing the inner tapered end of the flange 25-around the portion 26 of the stern and beneath the shoulder l1 as shown in Fig. 5. When the tubular die 30 is withdrawn, the assembled damper may be removed from the die block 21, the sheet metal damper plate 23 being thus rigidly clamped upon the screw threaded stem I6.

The advantages of this method of attaching the sheet metal damper plate to the screw threaded stem are obvious, since with this arrangement, it is possible to use a stern formed of a gray iron casting which costs considerably less than a malleable iron casting.

By providing the outwardly diverging angular arms 22 upon the handle portion of the damper;

it will be seen that the tips of these arms, which are the only part engaged by the thumb and linger in adjusting the damper, are located considerably farther away from the hot damper than the usual handle construction in which the arms extend outward at right angles to the stem, thus permitting the operation of the damper without danger of burning the thumb or linger.

I claim:

A damper including a threaded stem having a handle portion at one end, an unthreaded, conical portion adjacent to said handle portion, an integral, annular shoulder at each end of said conical portion of the stem, and a sheet metal damper plate having a central opening surrounded by an annular tapered ange having an annular shouldered portion tightly tting against one of said shoulders, the edge of said flange tightly tting against the other shoulder, and the tapered flange being rigidlyclamped upon the conical portion of the stem.

MARTIN L. HUNKER. 

